Query data using the Azure Data Explorer Python library
In this article, you query data using the Azure Data Explorer. Azure Data Explorer is a fast and highly scalable data exploration service for log and telemetry data.
Azure Data Explorer provides a data client library for Python. This library enables you to query data from your code. Connect to a table on the help cluster that we have set up to aid learning. You can query a table on that cluster and return the results.
- Python 3.4+
- A Microsoft account or an Azure Active Directory user identity to access the help cluster
Install the data library
pip install azure-kusto-data
Add import statements and constants
Import classes from the library, as well as pandas, a data analysis library.
from azure.kusto.data import KustoClient, KustoConnectionStringBuilder from azure.kusto.data.exceptions import KustoServiceError from azure.kusto.data.helpers import dataframe_from_result_table import pandas as pd
To authenticate an application, Azure Data Explorer uses your AAD tenant ID. To find your tenant ID, use the following URL, substituting your domain for YourDomain.
For example, if your domain is contoso.com, the URL is: https://login.windows.net/contoso.com/.well-known/openid-configuration/. Click this URL to see the results; the first line is as follows.
The tenant ID in this case is
6babcaad-604b-40ac-a9d7-9fd97c0b779f. Set the value for AAD_TENANT_ID before running this code.
AAD_TENANT_ID = "<TenantId>" KUSTO_CLUSTER = "https://help.kusto.windows.net/" KUSTO_DATABASE = "Samples"
Now construct the connection string. This example uses device authentication to access the cluster. You can also use AAD application certificate, AAD application key, and AAD user and password.
KCSB = KustoConnectionStringBuilder.with_aad_device_authentication( KUSTO_CLUSTER) KCSB.authority_id = AAD_TENANT_ID
Connect to Azure Data Explorer and execute a query
Execute a query against the cluster and store the output in a data frame. When this code runs, it returns a message like the following: To sign in, use a web browser to open the page https://microsoft.com/devicelogin and enter the code F3W4VWZDM to authenticate. Follow the steps to sign-in, then return to run the next code block.
KUSTO_CLIENT = KustoClient(KCSB) KUSTO_QUERY = "StormEvents | sort by StartTime desc | take 10" RESPONSE = KUSTO_CLIENT.execute(KUSTO_DATABASE, KUSTO_QUERY)
Explore data in DataFrame
After you enter a sign in, the query returns results, and they are stored in a data frame. You can work with the results like you do any other data frame.
df = dataframe_from_result_table(RESPONSE.primary_results) df
You should see the top ten results from the StormEvents table.